JPH0829487B2 - Work support device - Google Patents

Description

The present invention relates to a work supporting device used in an optical element polishing machine.

[Conventional Technology] The conventional technology is "Optical element processing technology '85 I-2 grinding / polishing", issued by Japan Optical Industry Technology Association on September 10, 1985.) 113
~ The explanation will be based on the contents described on page 116.

Generally, a work supporting device of an optical element polishing machine is configured as shown in FIG. 8 which illustrates processing (concave surface polishing) of an optical lens. In FIG. 8, 101 is a polishing dish having an upper convex surface, which is rotatably provided around an axis. Above the polishing dish 101, a hairpin 102 is provided so as to be capable of swinging movement such as a circle, arc, ellipse, or straight line. A hairpin 102a is formed at the lower end of the hairpin 102, and a sticking plate 103 is attached to the funnel ball 102a so that it can swivel freely. A lens 104 is attached to the lower surface of the attachment plate 103 with the surface to be polished facing downward.

According to the device having the above configuration, the hairpin 1 of the hairpin 102
Polishing the surface to be polished of the lens 104 by pressing the lens 104 against the polishing dish 101 with the spherical center Q of 02a as a supporting point, swinging the pinion 102, and rotating the polishing dish 101. Is.

Here, when a point on the outer periphery of the lens 104 is P, and a tangent line at the point P is PN, ∠QPN = θ ₁ is called a polishing angle, and if the polishing angle θ ₁ is sufficiently small, stable polishing can be performed, High surface accuracy can be obtained.

[Problems to be solved by the invention]

However, in the case of the convex surface polishing, the polishing angle θ ₂ becomes large as shown in FIG. 9, and polishing cannot be performed. In this case, a method in which the lens 104 is constantly pressed in the vertical direction with respect to the polishing dish 101, that is, a polishing machine called a ball center polishing machine that can press through the ball center of the polishing dish 101 is also processed. Can not do it.

Therefore, as shown in FIG.
By setting the lower shaft side to the lower shaft side and the polishing dish 101 to the upper shaft side, processing is possible.

However, in the case of such a polishing method, unless the diameter of the polishing dish 101 is smaller than the diameter of the polishing dish 101 in the polishing method shown in FIG. I can't do it. In this case, the polishing dish
When the diameter of 101 is made small, the spherical surface of the polishing dish 101 changes rapidly, and it becomes difficult to stabilize the curvature when many lenses 104 are processed. Further, in the case of the configuration shown in FIG. 10, since the shaft lower end portion of the sticking plate 103 is connected to the rotation driving device by screwing or taper fitting, replacement work of the sticking plate 103 for each lens is performed. Was complicated, and it was sometimes caught in the case of taper fitting.

That is, conventionally, when the lenses 104 were polished one by one, it was not possible to stably process all the lenses with the polishing dish 101 arranged below the lenses 104. The present invention has been made by paying attention to such a conventional problem, and can be applied to a work (lens or the like) having any radius of curvature regardless of whether it is a concave spherical surface, a flat surface, or a convex spherical surface. Provided is a work holding device for an optical element polishing machine, which can perform stable polishing and can obtain high surface accuracy.

[Means for solving problems]

FIG. 1 is a conceptual diagram showing a configuration of a work supporting device 1 according to the present invention. As shown in the figure, the work supporting device 1 is
A stay 2 fixed to the upper shaft (not shown) of the ball-center polishing machine
A swing arm 3 rotatably supported on the lower end of the stay 2 via a first support shaft 123, and a swing arm 3 rotatably supported on the swing arm 3 via a second support shaft 125. The second supporting shaft portion 125.
The axis line is set so as to intersect with the axis line of the first support shaft portion 123, and the work support shaft 7 is set so as to be swingable in one direction with respect to the stay 2. The axis of the work support shaft 7 is set so as to pass through the center of curvature O of the work 9 supported by the work support shaft 7. The rotation axis Z of the work 9 passing through the center of curvature O of the work 9 and the axis of the first rotation shaft 123, that is, the rotation axis X of the swing arm 3 intersect at one point S, and this point S is the work 9 It is set to be located below. The point S corresponds to the ball center Q of the hairpin sphere 102a shown in FIGS.

In the above configuration, a holding means such as a grindstone or a suction arm may be provided to hold the work support shaft 7 on the swing arm 3.

[Operation] In the above configuration, since the point corresponding to the center of the conventional hairpin is an imaginary point, there is no physical limitation, and the imaginary point is placed, for example, inside the work 7 or the polishing dish. It becomes possible to continue the point of. As a result, the polishing angle can be set arbitrarily, and the polishing angle can be made sufficiently small. The polishing angle is preferably set within 30 degrees.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 2 to 7. In the following description, the same components as those shown in FIG. 1 are designated by the same reference numerals.

(First Embodiment) FIG. 2 shows a first embodiment of the work supporting device 1 according to the present invention.

In the figure, reference numeral 2 denotes a stay fixed to the upper shaft of the polishing machine, which is not shown. At the lower end of the stay 2, an L-shaped swing arm 3 is supported via a support shaft 4 and a bearing 5 with the horizontal portion facing upward. 6 is a nut member. A work support shaft 7 is detachably supported on a horizontal portion of the upper part of the swing arm 3 via a bearing 8, and a convex lens (work) 9 as a workpiece is mounted on a lower surface of the work support shaft 7. It is supported. The rotation axis Z of the work support shaft 7 passes through the center of curvature O of the convex lens 9 which is the work, and intersects with the axis X of the support shaft 4 at a point S (both in the case of being orthogonal and in the case of not being orthogonal). Is set to. This point S is the convex lens 9
A line segment PQ orthogonal to a line segment OP connecting the center of curvature O of the and the point P on the outer periphery of the convex lens 9, that is, a tangent line PQ at the point P,
The point S, which is the intersection with the rotation axis X of the swing arm 3, is located below the convex lens 9. Therefore, the polishing angle is set to 0 degree.

According to the above configuration, the convex lens 5, which is the object to be processed, can be ground by swinging and swinging the upper plate or the polishing dish that makes a rotary motion about the spherical center O.

Further, in the structure of the present embodiment, the point corresponding to the ball center of the hairpin in the prior art is an imaginary point, so there is no physical limitation. Therefore, for example, the imaginary point can be present inside the convex lens 9 that is the object to be processed or inside the polishing dish (not shown). As a result, since the polishing angle can be set to 0 degree, the convex lens 9 can be stably polished by swinging and swinging the polishing dish which makes the upper axis or the rotational movement around the spherical center O as a center, and the high surface can be obtained. It is possible to obtain accuracy.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. This embodiment shows an example in which a work support shaft (sticking plate) 7 having a concave lens (workpiece) 20 stuck to the tip of the shaft is used. Also in this embodiment, as in the first embodiment, the shape and dimensions of the work support shaft 7 are set so that the point S passes through the tangent line PN at one point P on the outer periphery of the concave lens 20, and the polishing angle is It is set to 0 degrees. Since other configurations are the same as those shown in FIG. 2, the same members are designated by the same reference numerals and the description thereof will be omitted.

According to the above configuration, the concave lens 20 can be polished stably. Moreover, since the configuration of the present embodiment can be obtained simply by changing the shape and size of the work support shaft 7 in the configuration of the first embodiment and attaching / detaching it to / from the bearing 8, the concave lens 20
However, it is possible to stably grind lenses (workpieces) having different shapes (unevenness, etc.) or different dimensions (curvature, diameter, etc.). Other functions and effects are the same as those of the first embodiment, and thus the description thereof is omitted.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention. In this embodiment, the swing arm 3 is formed in a U-shape, and the horizontal portion 3a is set up, and both legs 3b of the stay 2 are supported via the support shafts 4 which are arranged to face each other. The support arm portion 2a at the lower end is rotatably supported. The axis line of the support shaft 4 arranged to face each other is located on the X-ray in FIG. 2, and at a point S on this axis line, the rotation axis line Z of the work support shaft 7 and the workpiece are processed at the same point S as in the first embodiment. Is set so as to intersect with a tangent line PQ passing through an arbitrary point P on the outer periphery of the convex lens 9. Since other configurations are similar to those shown in FIG. 2, the same members are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, since the swing arm 3 is supported on both sides, the rigidity can be increased. Therefore, it is possible to prevent the work supporting device 1 from being bent due to the bending of the support shaft 4 even if a working pressure is applied during working, and it is possible to prevent the work supporting device 1 from bending on the X axis.
The points can be held stably. As a result, the polishing angle can be stably maintained at 0 degree even when a large processing load is applied during polishing, which is advantageous in that a processed product having higher surface accuracy can be obtained.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment of the present invention. The feature of this embodiment is that an arm 41 holding a magnet 40 above the work support shaft 7 is provided.
Is provided, and the work support shaft 7 is held so as not to fall due to the magnetic force of the magnet 40. The arm 41 may be fixed to the stay 2, but it is preferable that the arm 41 be attached to a moving means (not shown) so that the arm 41 can be retracted upward when processing a workpiece. That is, when the dependent rotation of the convex lens 9 which is the work is disturbed by the influence of the magnetic force during the machining of the work, it causes the deterioration of the spherical accuracy, so that the magnet 40 is not affected by the magnetic force during the machining of the work. This is because it is preferable to move up. Since other configurations are similar to those shown in FIG. 4, the same members are designated by the same reference numerals and the description thereof will be omitted.

According to the above configuration, the convex lens 9 does not drop from the work holding device 1 even when the polishing dish and the convex lens 9 are not in contact with each other. Therefore, if the loading device is installed, the work can be automatically loaded and unloaded, and the workability and work efficiency in the working work can be improved.

(Fifth Embodiment) FIG. 6 shows the structure of the essential parts of a fifth embodiment of the present invention. In this embodiment, instead of the magnet 40 shown in FIG. 5, the arm support shaft 7 can be held by an air suction force. Since the configuration of the arm 41 other than the components is the same as that shown in FIG. 5, its illustration and description are omitted.

A groove 51 for fitting an O-ring 50 is formed on the lower end surface of the arm 41, and an O-ring 51 for hermetically sealing is fitted in the groove 50. A hollow vent hole 52 penetrates through the axial center of the arm 41, and the vent hole 52 is a vacuum suction device (not shown).
It is connected to. The arm 41 is arranged above the work support shaft 7 and is set so as to be movable up and down via a moving device (not shown). Then, during the machining of the workpiece, the vacuum suction is released and the arm 41 is moved upward, and after the machining is completed, the O-ring 50 is moved downward to a position where the O-ring 50 comes into contact with the upper surface of the workpiece support shaft 7 (see FIG. 5) to suck the workpiece. Is set so that the work can be detached from the polishing dish.

Even in the above-mentioned structure, the same action and effect as those of the fourth embodiment can be obtained. Particularly, according to the present embodiment, the O-ring 50 serves as a cushioning material and exhibits a sealing effect when sucking. It is possible.

Further, according to the configuration of this embodiment, the work can be held regardless of the material of the work support shaft 7. Therefore, the work (lens to be processed) can be automatically loaded and unloaded, and the workability and work efficiency in the working work can be improved.

(Sixth Embodiment) FIG. 7 shows a sixth embodiment of the present invention. In this embodiment, a holder 60 for holding a work is used as the work supporting shaft 7 in the structure shown in FIG. 4, and the convex lens 9 as the work can be held without being fixed. The holder 60 has a concave portion 61 for fitting and holding the convex lens 9 to hold the convex lens 9 therein.
And a shaft portion 60b fitted with the bearing 8 and fixedly held to the bearing 8 via a nut member 62 screwed to a screw portion 60c screwed to the shaft end portion of the shaft portion 60b. It is like this. A suction hole 63 penetrates the shaft center of the holder 60,
It is set so that the convex lens 9 can be suction-held in cooperation with the arm 41 arranged above the holder 60. Other configurations are similar to those shown in FIGS. 4 and 6,
Similar members are denoted by the same reference numerals, and description thereof is omitted.

According to this embodiment, the lens 9 as a work can be detached and attached as a single unit, so that the step of attaching and detaching the lens is not necessary. A configuration without the arm 41 is also possible, but when the arm 41 is provided, the lens can be easily attached and detached.
As a result, the lens 9 can be automatically loaded and unloaded, and the workability and work efficiency in the polishing work can be improved.

[Advantages of the Invention] As described above, according to the present invention, a flat surface, a lens close to a flat surface, a convex lens, a concave lens, and other workpieces can be held accurately, and stable processing is possible.
It is possible to promote automation of polishing and the like.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a device according to the present invention, FIG. 2 is an explanatory view showing a first embodiment of the device according to the present invention, and FIG. 3 is a second embodiment of the device according to the present invention. FIG. 4 is an explanatory view showing a third embodiment of the device according to the present invention, FIG. 5 is an explanatory view showing a fourth embodiment of the device according to the present invention, and FIG. FIG. 7 is an explanatory view showing a main part of a fifth embodiment of the apparatus according to the invention, FIG. 7 is an explanatory view showing a sixth embodiment of the apparatus according to the present invention, and FIGS. 8 to 10 are explanations of prior art. It is a figure. 2 ... Stay 3 ... Swinging arm 7 ... Work support shaft 9 ... Work (workpiece) 123 ... Support shaft 125 ... Support shaft

Claims (2)

[Claims] 1. A work support shaft for supporting a work, which is a workpiece, at a tip of the shaft, the work support shaft being rotatably supported about the work support shaft, and intersecting with a rotation axis of the work support shaft. A swing arm that swings the work support shaft around a support shaft that is disposed on the axis of the swing shaft, and a stay for mounting the support shaft that swingably supports the swing arm, And a work supporting shaft configured to be swingable in one direction with respect to the stay. 2. A work support shaft for supporting a work, which is a workpiece, at a tip of the shaft, the work support shaft being rotatably supported around the work support shaft, and intersecting with a rotation axis of the work support shaft. A swing arm that swings the work support shaft around a support shaft that is disposed on the axis of the swing shaft, and a stay for mounting the support shaft that swingably supports the swing arm, Holding means for holding the work supporting shaft for supporting the work with respect to the swing arm, and the work supporting shaft is configured to be swingable with respect to the stay in one direction. Work support device.